BaldosaCheck: Hollow Tiles

BaldosaCheck turns your phone's microphone, accelerometer and, optionally,
vibration motor into a guidance tool for comparing tiles and screening for
areas that may be hollow or poorly bonded.

First, calibrate the app on a tile you know is properly bonded. BaldosaCheck
analyses surrounding noise and vibration for 2–8 seconds. It compares moving
windows, finishes when it finds a stable interval and applies a prudent
sensitivity setting. Then place the phone against or very close to the area you
want to check. The app verifies that it is still and guides you through five
gentle knuckle knocks. It compares the readings and automatically excludes
outliers.

You can also voluntarily enable Automatic Beta mode. With this method, rest the
phone flat on the tile and the app generates a controlled vibration, so no
knocking is required. Its five-reading calibration is independent from manual
calibration, and each test compares five reinforced automatic readings.

The app analyses:

- Resonance duration.
- Sound frequency distribution.
- Consistency across five readings and any detected outliers.
- Difference from your solid reference.
- In Beta mode, the acoustic and mechanical transmission of a vibration
adapted to the phone's motor.

Main features:

- Calibration adapted to the microphone and surroundings.
- Spanish and English interface with automatic device-language detection.
- Manual language selector in Settings.
- Stability check before every knock or automatic reading.
- Clear result with a guidance index and confidence level.
- Multi-factor confidence based on consistency, signal, contact, calibration
and phone compatibility.
- Five-reading reinforced measurement with automatic exclusion of up to two
outliers.
- Live stability, contact and pressure indicator; poorly supported automatic
readings are repeated.
- Optional microphone, accelerometer and vibrator diagnostics with stability
controls automatically adapted to the phone.
- On-device history for comparing different areas.
- Adaptive 2–8 second ambient adjustment in every Manual or Automatic Beta
calibration, selecting the most stable window.
- Live sensitivity, stability, noise, vibration, time and progress without
moving the screen.
- A quality gate that prevents applying the setting if conditions never settle.
- Independent Manual and Automatic Beta sensitivity from 50 to 150 with
single-point precision.
- Unchanged recommended value 100, fine controls and quick reset.
- Professional endpoints: 50 makes the response almost inactive while 150
provides extreme sensitivity.
- Optional experimental automatic mode, clearly identified as Beta.
- Manual and automatic references stored separately.
- No account, advertising or Internet connection required.

Privacy by design:

Audio is processed in real time on the device. No recordings are created,
samples are never transmitted and no personal data is collected.

Important:

BaldosaCheck provides an acoustic comparison for guidance. Results may vary
with tile type and thickness, adhesive, phone placement, surrounding noise and
knocking technique. The index is not a physical percentage of detached
surface. Repeat the test at several points and ask a qualified professional to
confirm any diagnosis before carrying out work.